已知椭圆
的左右焦点分别为
,
,其离心率为
,点
在椭圆E上.
(1)求椭圆E的标准方程;
(2)经过椭圆E的左焦点
作斜率之积为
的两条直线
,
,直线
交椭圆E于A,B,直线
交椭圆E于C,D,G,H分别是线段AB,CD的中点,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8339ac52e677de1c4abd8da8b9d715.png)
(1)求椭圆E的标准方程;
(2)经过椭圆E的左焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b4f626c194ee8f1c2058293fe68570a.png)
20-21高二上·浙江嘉兴·期末 查看更多[3]
浙江省嘉兴市2020-2021学年高二上学期期末数学试题浙江省湖州市德清县第三中学2020-2021学年高二下学期返校考试数学试题(已下线)专题10 圆锥曲线的方程的典型题(二)-【尖子生专用】2021-2022学年高二数学考点培优训练(人教A版2019选择性必修第一册)
更新时间:2021-01-31 09:03:43
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解答题-问答题
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【推荐1】已知椭圆C:
经过点
,且离心率为
.
(1)求椭圆C的方程;
(2)若一组斜率为2的平行线,当它们与椭圆C相交时,证明:这组平行线被椭圆C截得的线段的中点在同一条直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310f780f4f03699023b1322a1e002539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求椭圆C的方程;
(2)若一组斜率为2的平行线,当它们与椭圆C相交时,证明:这组平行线被椭圆C截得的线段的中点在同一条直线上.
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【推荐2】如图,点A是椭圆C:
的短轴位于x轴下方的端点,过A作斜率为1的直线l交椭圆于点B,若点P的坐标为(0,1),且满足BP
x轴,
,求椭圆C的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ecbeac42288fc9d2953ad9252bf418d.png)
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解题方法
【推荐1】已知椭圆
:
的左顶点为
椭圆
的离心率为
.
(1)求椭圆
的标准方程;
(2)设椭圆
与曲线
的交点为
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079dd115a4b8cbc93918a853363786dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3560ffd9800a5decdebcc1cd4906d0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
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【推荐2】已知曲线
:
的左、右顶点分别为A,B,设P是曲线
上的任意一点.
⑴当P异于A,B时,记直线PA,PB的斜率分别为
,
,求证:
是定值;
⑵设点C满足
,且
的最大值为7,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914075a4574c09bdb860d8f8f09a4e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
⑴当P异于A,B时,记直线PA,PB的斜率分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b881044b5c73db6fcce110525741b02.png)
⑵设点C满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5c111a3f3545144fb61210443f0b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4448a069a477b7a5a81a75d3469fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/eba1bc32-143f-4080-b95d-17b048f9a87f.png?resizew=164)
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